🇺🇸 878 area code
Area code 878 covers Pittsburgh, Monroeville, Coraopolis and Bridgeville and the surrounding area in Pennsylvania. It shares that territory with 412, so the same neighbourhood can have numbers in any of them. Enter an 878 number below for a free check before you call back.
- Location: Pittsburgh, Pennsylvania
- Time zone: Eastern (UTC−5)
- In service since August 17, 2001
Consultar un número
Validez, operador, tipo de línea y región en la primera pasada.
Area code 878 at a glance
- Area code
- 878
- Location
- Pennsylvania, United States
- Main cities
- Pittsburgh, Monroeville, Coraopolis, Bridgeville, Carnegie, McKees Rocks
- Time zone
- Eastern (UTC−5)
- Local time now
- —
- In service since
- August 17, 2001
- Created from
- 412
- Overlay codes
- 412
- Local calls
- Dial 10 digits
- Number format
- (878) 555-0123
- From abroad
- +1 878 555 0123
Cities in the 878 overlay area
- Pittsburgh
- Monroeville
- Coraopolis
- Bridgeville
- Carnegie
- McKees Rocks
- McKeesport
- Bethel Park
- Sewickley
- Clairton
Is a 878 call a scam?
An area code tells you where a number was first assigned, not where the caller is. Mobile numbers keep their area code when people move, and internet (VoIP) numbers can be picked in any area code — so an 878 number can be calling from anywhere.
Robocallers exploit that with "neighbor spoofing": showing an 878 number to people in Pennsylvania because a local-looking call is more likely to be answered. If an 878 call claims to be your bank, the IRS or a delivery company, hang up and call the official number yourself.
About area code 878
878 entered service on August 17, 2001, as an overlay on 412, which had run short of numbers.
It is part of the 412/878 overlay: the codes cover the same area, and a new line there can be given a number in any of them. Two neighbours — or two phones in one household — can have different area codes. That is also why local calls need the full ten digits.
Because 878 overlays the same ground, the cities listed are those of the codes it shares with.
Preguntas frecuentes
Area code 878 questions
Sources: NANPA NPA database (11/04/2026) and Google libphonenumber. Area codes show where a number was assigned, not where its owner is today.
Where is area code 878?
Area code 878 is in Pennsylvania, United States. It covers Pittsburgh, Monroeville, Coraopolis, Bridgeville, Carnegie and McKees Rocks.
What time zone is area code 878?
878 is in the Eastern (UTC−5) time zone, and observes daylight saving time.
What area codes overlay 878?
412 serves the same area as 878. Numbers in all of them are local to one another.
When did area code 878 start?
878 entered service on August 17, 2001, created from 412.
How do I find out who called me from 878?
Enter the full number in the lookup at the top of this page. The free check confirms whether the number is valid and shows its carrier, line type and region; a full report adds owner and public-web records where they are available.
Why am I getting calls from area code 878?
If you live in or near Pennsylvania, they may be genuinely local — or robocalls spoofing a local-looking number. Unknown 878 callers who will not leave a message are best looked up before you call back.
Got a call from 878?
Run the free check first — validity, carrier, line type and region — and unlock the full report only if you need it.